DE704645C - Process for the separation of slag containing metal granules - Google Patents

Description

Process for the separation of slag containing metal granules In most metallurgical processes aimed at the production of more or less valuable slag, for example vanadium slag, the slag obtained with more or less large particles of the metal bath, see above. Granules, interspersed. The slag from the ironworks process is mixed with iron granules, the proportion of which can range from a few Z, ZD percentages to 50 0.1 percent of the amount of slag and more. For further processing of this slag, in most cases a clean separation of slag and granules is required, which is achieved by grinding. In this way of working, care must be taken to ensure that, on the one hand, a fine, granule-free slag meal is produced and, on the other hand, iron granules that are as bright as possible, that is, slag-free, are left behind. The endeavor ZD is therefore aimed at smashing as few iron granules as possible with the most complete possible capture of the slag in flour form, for which the possibility is given, since the slag is usually brittle, the granules, on the other hand, usually tough and. therefore are difficult inahlhar.

When grinding a pre-crushed slag containing granules in a normal ball mill, i.e. a ball roller mill, is dangerous extensive iron shattering, and the evil situation arises that the mill gradually fills up with granules and as a result from time to time it becomes complete must be cleared out to remove the iron granules left in the mill to separate the grinding media.

In many cases, the pre-crushed material is left to remove this problem slag Run over a - # la, -not ## - roller and pull out the iron granules. This u However, it does not work if the slag is rich in Fe ", 0", i.e. is itself magnetic is, or if the mixture of slag and granules is so intimate that (3 also unge of the iron droplets contained therein as a result of magnetic slag pieces Mal-Inetes are attracted.

However, a clean separation of granules and slag can be achieved easily achieved in a manner known per se, - ii that one with Slotted. Trominel mill. in which the pre-ehrocherie good by a or two axial openings, used with an air classifier works together, which is constantly on the grinding drum. falling mixture of Slag and granules are fed in uninterrupted stream. Before it gets into the Enters the air classifier, it goes over a sieve, so that only the fine ones, sufficiently reduced in size Parts in the bleach air classifier -elan-, en can, # while the -larger pieces of slag returned to the mill. The lighter Schlal, -kenmehl is now used in the Windsicliter lier-blown, and the heavier iron granules and the coarser granules interspersed slag pieces are shared with that remaining above the sieve Larger material is fed back into the grinding drum through the axial opening.

b This work process can be carried out for as long as 11, two-time uninterrupted feeding of fresh slag. until the mill has been so filled up through constant accumulation of granules and gi - # iiialieiireiclipn slag. that a further supply of slag is no longer possible or inexpedient for technical reasons. This so-. You can tell by the consumption of electricity and the sound of the mill.

According to the invention, this Cbelstand is eliminated by d, al-) If there is a threat of overfilling the mill, the slag feed is shut off periodically and then conveyed the feed material in the circuit between the mill and the air classifier for a long time is until all of the pure slag components are removed and in INIchlforin are blown out '. while those circling between the mill and the air separator do not ground granules are discharged for themselves. The slag feed can then to start the mill again and the process repeats itself.

With reference to the drawing, the Ver-Z, described forming fol-drive, in: The C to be ground vorgebrocheiie mixture of slag and granules is aufgegebün from the 'Erichter a means Drelitt-IIER and gehingt b through the conduit and d on the elevator on the sieve e. The fine fractions fall through this sieve into the air sifter, in which the lighter slag mill comes out - '# (- blows -, shakes through the pipe u into a special bunker. The heavy iron granules and the coarser pieces of slag interspersed with granules fall out down through the line to the air separator and there unite with the very large pieces that remain over the sieve and fall in through the line, to be fed to the drum mill through an axial opening 1. The drum has jacket slots through which the slag and granules existing in the slag and granules Günienge in a pre-cut shape falls out into the funnel-shaped container, whereupon it is fed through the pipes to the elevator. From here on, the pre-ground material arrives again on the sieve, where the separation and coarser parts take place the supply of fresh slag to the container a takes place continuously, so the Trominelmühlek is after After a certain time, as a result of increasing enrichment of the ground material with granules and granule-rich slag, the work has to be interrupted.

G, mal ') of the invention, the addition of fresh slag from the container is stopped at this point, and the slag in the drum, enriched with granules, is circulated between the mill k and the air separator f with the aid of the elevator d until the Slag constituents are largely ground and blown out through the pipe on the wind sifter into the flour bunker, so that there are only almost bare iron granules in the grinding plant. At this moment the two flaps o, p built into the lines h, i are temporarily turned over so that the granules continuously discharged from the grinding drum k and your air classifier f are diverted from the process through the nozzles q, r . The grinding plant remains in uninterrupted operation until all the granules in the grinding plant have been removed. The flaps o, p are then returned to their old position and fresh slag is again drawn up from your container a, whereupon the process is repeated over and over again.

If the slag before the task in the mill not have been so weitgehund broken 'that they can fall through the casing slots of the mill to be installed in a conventional manner on the casing of the drum mill a few normally overall connected slots of time be opened at times when the mill has excessively large granules which will cause the coarse granules to fall out of the mill together with the used grinding media. These slots are then closed again, and the grinding system can continue to operate in the manner described above.

According to the method described, the following is achieved: The won Slag flour is practically free of metal flour: it is therefore not made of metal diluted. The power consumption of the grinding system is not unnecessary due to the grinding the harder-to-grind metal granules increased. On the other hand, it's the one Slag adhering to the granules is completely ground out, so that practically no slag can be lost with the granules.

Claims (1)

PATENT CLAIM: Process for the separation of metal granules containing Slag into almost pure slag powder and bare granules by bypassing the Mixture in the circuit between a drum mill and an air classifier un - interrupted task of the slag-granule-Gernenges, characterized by that the feed after excessive filling of the mill as a result of enrichment of the abandoned granules temporarily parked and then the abandoned goods like that long in the cycle between refuse and wind sifter * until the entire pure slag components are ground out and blown out in flour form, while the unground granules circling between the mill and the air separator to be discharged for themselves.